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Flexural Bond Behavior of Rebar in Ultra-High Performance Concrete Beams Considering Lap-Splice Length and Cover Depth

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Engineering（科研） 2016年第3期8卷 116-129页

作者： Seongjun Kim Jungwoo Lee changbin joh Imjong Kwahk Korea Institute of Civil Engineering and Building Technology Goyang South Korea

This study intends to find out the correlation between the cover depth and the bond characteristics of UHPC through pull-out tests of UHPC specimens with different cover depths and bond tests of rebar using flexural members. In this experimental study, specimens are fabricated with the lap-splice length as test variable in relation with the calculation of the lap-splice length for 180- MPa UHPC. Moreover, specimens are also fabricated with the cover depth as test variable to evaluate the effect of the cover depth on the UHPC flexural members. The load-displacement curves are analyzed for each of these test variables to compute the lap-splice length proposed in the K-UHPC structural design guideline and to evaluate the influence of the cover depth on the flexural members. As a result, the stability of the structural behavior can be significantly enhanced by increasing slightly the cover depth specification of the current UHPC Structure Design Guideline from the maximum value between 1.5 times of rebar diameter and 20 mm to the maximum value between 1.5 times of rebar diameter and 25 mm.

关键词： Bond Behavior Ultra High Performance Concrete (UHPC) Lap-Splice Length Cover Depth Flexural Bond Test Full-Out Test

Load Transfer Test of Post-Tensioned Anchorage Zone in Ultra High Performance Concrete

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Engineering（科研） 2015年第3期7卷 115-128页

作者： Jee-Sang Kim changbin joh Yoon-Seok Choi Department of Civil & Architectural Engineering Seokyeong University Seoul The Republic of Korea Structural Engineering Research Division Korea Institute of Construction Technology Goyang The Republic of Korea TM Enc Research Institute Seoul The Republic of Korea

Researches on ultra-high performance concrete (UHPC) have been conducted worldwide owing to its outstanding durability and strength performances. The exploitation of the mechanical properties of UHPC will render it possible to achieve economic design through substantial reduction in the cross sectional dimensions and simplification in the reinforcement arrangement. This paper investigates experimentally the load transfer in the prestressed concrete anchorage zone. To provide distinctive features of UHPC compared to ordinary concrete, the cross sectional dimensions of the member were reduced and the stress distribution, deformation and cracking pattern of the PS anchorage zone were examined experimentally according to the degree of reinforcement of the members chosen. The distributions of the bursting stress, spalling stress and longitudinal edge stress in the specimens were observed according to the various types of reinforcement. All the specimens satisfied the load-bearing capacity criterion specified by the European ETAG-013 guidelines and their stress distributions were similar to those in the PS anchorages of post-tensioned members applying ordinary concrete. The cracks propagated longitudinally with lengths up to twice the cross sectional dimensions and their width was smaller than when applying ordinary concrete owing to the bridging effect of the steel fibers in UHPC. Accordingly, the exploitation of the high strength of UHPC enabled us to secure the resistance of the anchorage with no need for particular reinforcing devices.

关键词： UHPC PS Anchorage Zone Load Transfer Test Bursting Force Splitting Force

Advances in endoscopic management of biliary complications after living donor liver transplantation: Comprehensive review of the literature

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World Journal of Gastroenterology 2016年第27期22卷 6173-6191页

作者： Milljae Shin Jae-Won joh Department of Surgery Konkuk University Medical Center Konkuk University School of Medicine Department of Surgery Samsung Medical Center Sungkyunkwan University School of Medicine

Apart from noticeable improvements in surgical techniques and immunosuppressive agents, biliary complications remain the major causes of morbidity and mortality after living donor liver transplantation(LDLT). Bile leakage and stricture are the predominant complications. The reported incidence of biliary complications is 15%-40%, and these are known to occur more frequently in living donors than in deceased donors. Despite the absence of a confirmed therapeutic algorithm, many approaches have been used for treatment, including surgical, endoscopic, and percutaneous transhepatic techniques. In recent years, nonsurgical approaches have largely replaced reoperation. Among these, the endoscopic approach is currently the preferred initial treatment for patients who undergo duct-to-duct biliary reconstruction. Previously, endoscopic management was achieved most optimally through balloon dilatation and single or multiple stents placement. Recently, there have been significant developments in endoscopic devices, such as novel biliary stents, as well as advances in endoscopic technologies, including deep enteroscopy, the rendezvous technique, magnetic compression anastomosis, and direct cholangioscopy. These developments have resulted in almost all patients being managed by the endoscopic approach. Multiple recent publications suggest superior long-term results, with overall success rates ranging from 58% to 75%. This article summarizes the advances in endoscopic management of patients with biliary complications after LDLT.

关键词： Biliary complication Endoscopic retrograde cholangiography Endoscopic management Living donor Liver transplantation

Rapid hemostasis of the residual inguinal access sites during endovascular procedures:A case report

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World Journal of Clinical Cases 2022年第34期10卷 12684-12689页

作者： Hyangkyoung Kim Kwangjin Lee Sungsin Cho Jin Hyun joh Department of Vascular Surgery Kyung Hee University Hospital at GangdongSeoul 05278South Korea Department of Surgery Kyung Hee University Hospital at GangdongSeoul 05278South Korea

BACKGROUND In endovascular procedures including total percutaneous endovascular aneurysm repair(pEVAR),percutaneous access through the common femoral artery is most commonly ***-site bleeding is a major concern in percutaneous ***,we present a case of successful control of continuous oozing using a vascular closure device(VCD)and the application of Surgicel(johnson&johnson,United States)over the access *** SUMMARY An 82-year-old man presented with an unruptured abdominal aortic aneurysm measuring 83 mm×75 *** patient had a medical history of atrial fibrillation and was receiving rivaroxaban(15 mg/d).Routine pEVAR was performed using the preclose technique with ProGlide(Abbott,Santa Clara,CA,United States).Significant amount of bleeding was observed at the end of the procedure after the deployment of the closure device at the access site.A sheet of Surgicel was applied to the suture thread using a surgical *** was applied to the surface of the artery along the access tract using a pusher,and hemostasis was immediately *** This simple technique is an excellent adjunct to control residual bleeding from the access site following VCD use.

关键词： Endovascular procedures Punctures Hemostasis Hemostatic techniques Femoral artery Case report

Surgical treatment for rectal cancer:An international perspective on what the medical gastroenterologist needs to know

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World Journal of Gastroenterology 2008年第21期14卷 3281-3289页

作者： Rolv-Ole Lindsetmo Yong-Geul joh Conor P Delaney Department of Gastrointestinal Surgery University Hospital of North Norway and Institute of Clinical MedicineUniversity of TromsTromsN-9036Norway Department of Surgery Hansol HospitalSeoul 138-844South Korea Division of Colorectal Surgery University Hospital Case Medical CenterClevelandOhio 44106-5047United States

Rectal cancer accounts for one third of all colorectal *** age adjusted death rates from colorectal cancer have declined over recent decades due to a combination of colorectal cancer screening,improved diagnostic tests,improved standardized surgical technique,improved medical support,neoadjuvant chemotherapies and radiation treatment or combinations of *** of complex treatment algorithms,use of multidisciplinary teams in the management of rectal cancer patients has also been *** gastroenterologists performing colonoscopies are frequently the first health care provider to raise the suspicion of a rectal *** the diagnosis depends on histological confirmation,the endoscopic presentation is almost diagnostic in many *** order to meet the patient's immediate needs for information,it is important that the endoscopist has knowledge about the investigations and treatment options that will be required for their *** aim of this paper is to describe the modern preoperative investigations and operative procedures commonly offered to rectal cancer patients taking into account perspectives of three colorectal surgeons,practicing in the USA,Europe and Asia.

关键词： Rectal cancer management Evaluation Staging Neoadjuvant Adjuvant Surgical treatment Surveillance

Development and validation of a simple and multifaceted instrument,GERD-TEST,for the clinical evaluation of gastroesophageal reflux and dyspeptic symptoms

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World Journal of Gastroenterology 2017年第28期23卷 5216-5228页

作者： Koji Nakada Nobuyuki Matsuhashi Katsuhiko Iwakiri Atsushi Oshio Takashi joh Kazuhide Higuchi Ken Haruma Department of Laboratory Medicine Daisan Hospital Jikei University School of Medicine Department of Gastroenterology NTT Medical Center Tokyo Department of Gastroenterology Nippon Medical School Graduate School of Medicine Faculty of Letters Arts and SciencesWaseda University Department of Gastroenterology and Metabolism Nagoya City University Graduate School of Medical Sciences Second Department of Internal Medicine Osaka Medical College Department of General Internal Medicine 2 Kawasaki Medical School Kawasaki Hospital

To evaluate the psychometric properties of a newly developed questionnaire, known as the gastroesophageal reflux and dyspepsia therapeutic efficacy and satisfaction test (GERD-TEST), in patients with *** patients with predominant GERD symptoms recruited according to the Montreal definition were treated for 4 wk using a standard dose of proton pump inhibitor (PPI). The GERD-TEST and the Medical Outcome Study Short Form-8 Health Survey (SF-8) were administered at baseline and after 4 wk of treatment. The GERD-TEST contains three domains: the severity of GERD and functional dyspepsia (FD) symptoms (5 items), the level of dissatisfaction with daily life (DS) (4 items), and the therapeutic efficacy as assessed by the patients and medication compliance (4 items).RESULTSA total of 290 patients were eligible at baseline; 198 of these patients completed 4 wk of PPI therapy. The internal consistency reliability as evaluated using the Cronbach’s α values for the GERD, FD and DS subscales ranged from 0.75 to 0.82. The scores for the GERD, FD and DS items/subscales were significantly correlated with the physical and mental component summary scores of the SF-8. After 4 wk of PPI treatment, the scores for the GERD items/subscales were greatly reduced, ranging in value from 1.51 to 1.87 and with a large effect size (P < 0.0001, Cohen’s d; 1.29-1.63). Statistically significant differences in the changes in the scores for the GERD items/subscales were observed between treatment responders and non-responders (P < 0.0001).CONCLUSIONThe GERD-TEST has a good reliability, a good convergent and concurrent validity, and is responsive to the effects of treatment. The GERD-TEST is a simple, easy to understand, and multifaceted PRO instrument applicable to both clinical trials and the primary care of GERD patients.

关键词： Gastroesophageal reflux and dyspepsia therapeutic efficacy and satisfaction test Patient-reported outcome Gastroesophageal reflux disease Validity Reliability

Ankle and toe weakness caused by calcified ligamentum flavum cyst: A case report

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World Journal of Clinical Cases 2023年第35期11卷 8392-8398页

作者： Ho-Young Jung Geon-U Kim Yong-Won joh Jun-Seok Lee Department of Orthopedic Surgery Eunpyeong St.Mary’s HospitalCollege of MedicineThe Catholic University of KoreaSeoul 03312South Korea

BACKGROUND Ligamentum flavum cysts,which are most common in mobile junctional levels of the spine,can be a rare cause of spinal *** have been several case reports of ligamentum flavum ***,there is yet to be a documented case report of a calcified ligamentum flavum ***,we report the first case of a calcified ligamentum flavum cyst causing ankle and toe *** SUMMARY A 66-year-old male visited our hospital complaining of claudication as well as thigh and calf pain in his left leg,all beginning two weeks *** examination revealed motor weakness of the left ankle dorsiflexion and great toe *** spinal computed tomography scans showed spinal stenosis combined with a calcified mass at the left side of the L4-5 *** reso-nance imaging showed dural sac compression caused by the calcified mass at the left ligamentum flavum of the L4-5 *** performed decompressive laminectomy and excision of the calcified mass combined with posterior lumbar interbody fusion at the L4-5 ***-operatively,we found a firm and nodule like mass originating from the ventral surface of ligamentum *** examination suggested a calcified pseudocyst without a capsular *** the operation,the patient’s motor weakness in the ankle and great toe improved *** The patient’s ankle and great toe weakness were improved successfully after surgical removal of the calcified cyst.

关键词： Ligamentum flavum Calcified cyst Spinal stenosis Claudication Motor weakness Spine Case report

Advances in refractory ulcerative colitis treatment: A new therapeutic target, Annexin A2

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World Journal of Gastroenterology 2015年第29期21卷 8776-8786页

作者： Satoshi Tanida Tsutomu Mizoshita Keiji Ozeki Takahito Katano Hiromi Kataoka Takeshi Kamiya Takashi joh Department of Gastroenterology and Metabolism Nagoya City University Graduate School of Medical Sciences Nagoya city Aichi prefecture

Medical treatment has progressed significantly over the past decade towards achieving and maintaining clinical remission in patients with refractory ulcerative colitis(UC). Proposed mediators of inflammation in UC include pro-inflammatory cytokines such as tumor necrosis factor-α(TNF-α) and interleukin-2, and the cellsurface adhesive molecule integrin α4β7. Conventional therapeutics for active UC include 5-aminosalicylic acid, corticosteroids and purine analogues(azathioprine and 6-mercaptopurine). Patients who fail to respond to conventional therapy are treated with agents such as the calicineurin inhibitors cyclosporine and tacrolimus, the TNF-α inhibitors infliximab or adalimumab, or a neutralizing antibody(vedolizumab) directed against integrin α4β7. These therapeutic agents are of benefit for patients with refractory UC, but are not universally effective. Our recent research on TNF-α shedding demonstrated that inhibition of annexin(ANX) A2 may be a new therapeutic strategy for the prevention of TNF-α shedding during inflammatory bowel disease(IBD) inflammation. In this review, we provide an overview of therapeutic treatments that are effective and currently available for UC patients, as well as some that are likely to be available in the near future. We also propose the potential of ANX A2 as a new molecular target for IBD treatment.

关键词： Tumor necrosis factor-α Shedding Integrin α4β7 Epidermal growth factors

Using Micro-Level Data to Evaluate Infrastructure of the Walking Environment Around Bus Rapid Transit Stations:A Case Study of Xiamen,China

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China City Planning Review 2016年第2期25卷 18-25页

作者： Xu Junping Wang Peng Kenneth joh Bi Bo Department of Landscape Architecture and Urban Planning Texas A&M Universit Xiamen Government-High Level Returnee National Huaqiao University Department of Information and Research Tsinghua Tongheng Urban Planning and Design Institute Department of Landscape Architecture and Urban Planning Texas A&M University School of Architecture Tsinghua University

China has experienced rapid car-oriented suburbanization during the past decades and is facing emerging challenges such as traffic congestion,air pollution,and even health *** from North American cities,Chinese cities have started adopting and implementing a Transit-Oriented Development(TOD) strategy,which encourages the transit ridership and walking trips by creating a pedestrian-friendly urban *** much research has examined the walking environment in various neighborhoods or communities,few existing studies have examined the walking environment around transit stations,especially using micro-level data,such as walking infrastructure *** research chooses several infrastructure variables that are critical for pedestrians to investigate the walking environment around stations of the Bus Rapid Transit(BRT) No.1 Line in Xiamen City,*** study defines a half mile buffer centered on each station as the spatial unit of *** Geographic Information System(GIS) and field audits are employed to measure the characteristics of the infrastructure for pedestrians in each spatial unit of *** results of this analysis can help assess the existing conditions of the infrastructure for pedestrians in each station area,which might need to be added or *** findings will not only provide empirical support for improving TODs in Xiamen,but also offer a lesson on how areas around transit stations could be retrofitted to improve the pedestrian environment.

关键词： infrastructure TOD walking